The growing volume of cyber threats and the complexity of modern IT environments call for advanced tools to monitor, analyse and respond effectively to security incidents. One of the most robust and widely adopted solutions is SIEM (Security Information and Event Management). In short, SIEM security monitoring relies on a platform that integrates multiple security data sources, correlates events and generates alerts for potential threats. Moreover, this solution not only centralises security data but also automates its analysis, providing a real-time view of an organisation’s security posture.
Implementing a SIEM enables early threat detection and rapid incident response, but it also requires a well-defined strategy to be effective. This article therefore examines the main benefits, challenges and best practices for integrating this tool into any organisation’s security operations, as well as how to use it to gain a deeper and broader view of the IT environment.
1. Benefits of a well-implemented SIEM
1.1 A unified view of security
One of the main advantages of SIEM is its ability to consolidate data from different sources, such as firewalls, operating systems, applications and network devices, into a single platform. This centralisation provides a complete view of the security environment, which makes monitoring easier and allows efficient management. Furthermore, by aggregating data from across the IT infrastructure, the platform also makes it possible to identify patterns of anomalous behaviour.
1.2 Real-time SIEM security monitoring
SIEM enables real-time monitoring, which is essential for detecting cyberattacks and responding quickly. Continuous analysis of security logs and events allows teams to identify and respond to malicious activity as soon as it occurs, significantly reducing the impact of potential threats. Indeed, identifying incidents quickly is key to limiting damage and ensuring data integrity.
1.3 Automating log analysis in SIEM
Manually analysing large volumes of logs can be time-consuming and error-prone. A SIEM automates this process and, in many solutions, uses machine learning and artificial intelligence algorithms to identify suspicious patterns and generate alerts. As a result, it not only reduces the workload of security teams but also improves the accuracy of threat detection. In addition, automation helps prioritise critical events, so that the most serious incidents are handled urgently.
1.4 Regulatory compliance
Organisations face growing pressure to comply with data protection regulations, such as the GDPR (General Data Protection Regulation), and other cybersecurity standards. The platform helps meet these requirements by keeping detailed, auditable records of all security events. Moreover, the ability to generate detailed reports on security activity makes audits easier and demonstrates regulatory compliance. In this way, the organisation reduces the risk of fines and other penalties.
1.5 Faster incident response
With a SIEM, security teams can respond to incidents more quickly and effectively. Event correlation and automatic threat identification enable an immediate response. In addition, automation and orchestration features can even carry out preventive or corrective measures without human intervention. Consequently, this not only speeds up response times but also reduces the severity of attacks by stopping malicious activity before it causes significant damage.
2. Challenges in implementing a SIEM
Although SIEM offers many benefits, implementing it effectively is not without challenges. One of the main challenges is the need to configure the system correctly to avoid false positives, which can overwhelm security teams and reduce the platform’s effectiveness. For this reason, continuous tuning is needed to ensure that the system generates useful and accurate alerts.
Another challenge is the volume of data the platform processes. Without proper management, the number of logs and events can become overwhelming, making it harder to identify real threats. It is therefore essential to implement data retention and filtering policies that balance the amount of information stored with the relevance of the events monitored.
3. Best practices for using SIEM
3.1 Custom configuration
Every organisation has a unique IT environment. For this reason, the system configuration must reflect its specific needs. Defining custom rules that align with the company’s security priorities is essential to avoid information overload and maximise the system’s effectiveness.
3.2 Training the security team
A successful implementation requires a properly trained security team that can interpret the data generated and act appropriately. This includes the ability to respond quickly to alerts, adjust settings and optimise the platform’s performance as new threats emerge.
3.3 Integration with other security tools
To maximise its value, the platform should integrate with other security tools. For example, it can connect to firewalls, intrusion detection and prevention systems (IDS/IPS) and endpoint solutions. This integration, in turn, enables a stronger defence by correlating data from several security layers for a more coordinated incident response.
4. SIEM, SOAR and XDR: What is the difference
The cybersecurity market uses several complementary acronyms, so it is worth distinguishing the main ones:
| Tool | Main function |
|---|---|
| SIEM | Collects and correlates logs from multiple sources and generates alerts |
| SOAR | Automates and orchestrates incident response based on predefined procedures |
| XDR | Detects and responds to threats across endpoints, network, cloud and email in an integrated way |
Many current solutions combine these capabilities. Even so, SIEM remains the foundation for visibility and for keeping auditable records.
5. SIEM and the NIS2 Directive
Directive (EU) 2022/2555, known as NIS2, extended cybersecurity obligations to many sectors, such as energy, transport, health, industry and digital services. Among other requirements, the entities covered must manage cybersecurity risks and report significant incidents, with an early warning within 24 hours and a fuller notification within 72 hours.
To meet these deadlines, the organisation needs to detect incidents quickly and gather evidence. A well-configured SIEM is therefore an important tool for demonstrating detection, response and logging capabilities.
6. Practical example: Suspicious access to a document platform
Imagine a company whose SIEM receives the access logs from its document management platform. In the early hours of the morning, a contractor account downloads hundreds of documents within a few minutes, from a country where the company does not operate.
The SIEM correlates these events and generates a critical alert. The security team then blocks the account, revokes active sessions and contacts the contractor. Finally, it analyses the documents accessed to assess whether there has been a personal data breach. In this way, the incident is contained quickly and the company has the evidence it needs for any notifications.
7. The most important log sources
A SIEM is only useful if it receives the right logs. For this reason, implementation should start with the sources that are most valuable for threat detection:
- authentication systems and user directory;
- firewalls, VPN and network equipment;
- critical servers and workstations;
- cloud platforms and email;
- business applications with sensitive data, such as document platforms.
The organisation can then gradually extend collection to other sources. This avoids an excessive volume of low-value data and makes alerts more relevant.
Frequently asked questions
Does a small company need a SIEM?
Not always one of its own. Many small companies use managed monitoring services, which include a SIEM and a team of analysts, at more affordable costs.
How long should logs be kept?
It depends on legal, contractual and regulatory obligations. However, the retention period should allow incidents detected late to be investigated, without keeping personal data longer than necessary.
Does a SIEM replace the security team?
No. A SIEM generates alerts and gathers evidence, but it is people who analyse the context, decide on the response and improve detection rules over time. That is why ongoing training for analysts is as important as the technology itself.
Conclusion
SIEM is a powerful tool that offers a holistic view of IT security and improves the ability to detect and respond to threats. When implemented correctly, it can transform the way organisations monitor and protect their data, giving them a more proactive and resilient security posture. However, to get the most out of this tool, it is crucial to take a strategic approach that includes custom configuration, proper training and integration with other security solutions. Ultimately, with best practices in place, SIEM can be the key to protecting sensitive data and ensuring business continuity in an increasingly digital and interconnected world.
Read also: Access control and cybersecurity in document management and Compliance and cybersecurity: How to protect documentation.
For cybersecurity guidance, see the European Union Agency for Cybersecurity (ENISA).